@QWERTZ I bought another brand too, but keep an eye in this forum just to see when it is solved. My tplink C6 has OpenWRT for months, and is used as a wifi bridge in client mode. Perfect this way....

@Wetterhahn I was very happy with mi C6 EU V2 until the first one with onemesh.

@Mat2c Teng 14 dispositivos entre 2'4 y 5 ghz. No creo que sea la causa. Y todo estaba bien hasta la rama 1.3.x.

@Mat2c I have 14 devices between 2'4 and 5 ghz, so I don't think this is the cause. And with 1.2.x was ok.

@Mare007 Look at blocked devices (I think it is under firewall). Some times C6 blocks devices it thinks are dangerous (many intermitent connections, for example). The device seems contacted, but...

@Wetterhahn No, the problem appeared in 1.3.x. Prior firmwares were ok. I have been using this router intensively 5 months before the 1.3.x distaster.